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The problem in majority of the cases is related to the wrong DNS loading. The problem itself very often happens when you are behind several routers (like one from internet connection vendor and one your WiFi router) and until you don’t flush your current DNS configuration you can try anything but you won’t be successful.
What’s really funny that’s so easy – just run the command prompt with admin rights, then run the following command:

ipconfig /flushdns

make a coffee and get back to the WU heaven 🙂
All other applications are able to deal with that – WU not. From my point of view this is a bug and I am just surprised it’s nowhere documented.

Recently, I tried to run the .NET framework 1.1 supported application in Windows 8.1. As you may not know .NET Framework 1.1 is not supported on the Windows 8 or Windows Server 2012 operating system. In some cases, the .NET Framework 1.1 is specifically identified as required for an application to run. In those cases, you should contact your independent software vendor (ISV) to have the application upgraded to run on the .NET Framework 3.5 SP1 or later version.
But there are cases (very often) when the software version is old and you do not have the upgraded version of the software. In my case, I tried to install the package and got the following error message: “Setup cannot continue because this version of the .NET Framework is incompatible with a previously installed one“.

There are two methods to fix this issue.Method 1 – install .NET Framework 3.5
For some users all those apps which need .NET Framework 1.1 to run can work properly with .NET framework 3.5. So, you can optionally download .NET 3.5 and install it but make sure you can turn off 4.0 framework and other versions if you have it apart from 3.5. So you have to turn off .NET 4.0 and leave on .NET 3.5 – in my case, it didn’t solve the issue.

Method 2 – manually install .NET Framework 1.1
Download Microsoft .NET Framework 1.1 redistributable package (dotnetfx.exe). Make sure the setup file is saved as dotnetfx.exe. Download Microsoft .NET Framework 1.1 Service Pack 1 (NDP1.1sp1-KB867460-X86.exe). Make sure that the file is renamed and saved as dotnetfxsp1.exe, so that the rest of the steps can be followed easily. Move both installation files into the same directory (for example c:\dotnet).
This method involves recompiling the .NET framework 1.1 and then installing .NET Framework 1.1 with slipstreamed/integrated SP1 by running netfx.msi which will created in the working folder after running the following commands (run command prompt in admin mode and run the following command one by one):

dotnetfx.exe /c:"msiexec.exe /a netfx.msi TARGETDIR=C:\DotNet"

after it is installed

dotnetfxsp1.exe /Xp:C:\DotNet\netfxsp.msp

and

msiexec.exe /a c:\DotNet\netfx.msi /p c:\DotNet\netfxsp.msp

I hope one of the above method will work for you to run any app or program. Make sure to restart your PC after following any of the above methods.

If one or more of your icons are not displaying correctly, or that your icon cache is corrupted, then you might consider rebuilding the icon cache to reset and reload the icon images into the icon cache (the solution works on Windows 7 and Windows 8).

By the way – the icon cache is located at the hidden system folder location below:

C:\Users\USERNAME\AppData\Local\IconCache.db

This solution will not help with any of the following icon issues:
1. A shortcut’s icon that is not displayed properly due to the source of the shortcut being moved or deleted. You may need to recreate a new shortcut directly from the source (ex: program’s exe) file to replace it instead.
2. All icons for a specific file extension display the wrong icon. This may be do to setting the wrong association for what program to open the file extension instead. You can restore the default file extension’s associations to fix this icon instead.

To manually rebuild the icon cache using the command prompt you have to:
1. Close and save anything that you are working on (the following commands will kill explorer and restart the computer when completed).
2. Open a command prompt in Windows 7 or Windows 8.
3. In the command prompt, copy and paste each command line below exactly as is one at a time and press enter after each command: